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NSN 4820-01-646-5998

Relief Valve

About this product

Fully open: 165 deg and below; starts to close: 165-180 deg; fully closed: 180 deg; fluid: mil-h-83282; valve cracking pressure: 40 psid max, at 190-195 deg f; valve to reseat at 30 psid min.

Manufacturer part number 11-878 for national stock number 4820016465998.

Datasheet

  • Product description

    Pressure And Temperature Relief Valve NSN 4820-01-646-5998.

  • MPN or Model

    11-878

  • Schedule B
    8481.40.0000 (Safety or relief valves)
  • NMF (National Motor Freight)
    127220 - Pressure Reg/red/relief Valves NOI
  • Body Material
    Aluminum alloy, qq-a-200/8, alloy 6061, t6
  • Outside Surface Treatment
    Anodized, mil-a-8625, type 2
  • Body Style
    Straight thru
  • Stem Material
    Aluminum alloy, qq-a-200/8, alloy 6061, t6
  • Tempurature Rating
    -65.0 degrees fahrenheit and 320.0 degrees fahrenheit
  • Media For Which Designed
    Oil
  • First End Flange Shape Style
    Oval w/ bolt holes
  • First End Flange Thickness
    0.125 inches
  • First End Flange Length
    1.812 inches
  • First End Flange Width
    0.875 inches
  • First End Flange End Radius
    0.250 inches
  • First End Bolt Hole Quantity
    2
  • First End Bolt Hole Diameter
    0.221 inches
  • Second End Relationship With First End
    Not identical
  • Second End Style Designator
    Grooved
  • Seat Material
    Aluminum alloy, qq-a-200/8, alloy 6061, t6
  • Body Outside Diameter
    0.798 inches
  • Flow Control Device
    Stem and integral disk
  • Tempurature Control Device Type
    Thermostatic
  • First End Center To Center Distance Between Holes Along Length
    1.312 inches
  • Part Name Assigned By Controlling Agency
    Valve bypass hydr; valve, bypass thermal and pressure
Pressure And Temperature Relief Valve

A valve designed to release under excessive pressure and/or excessive temperature by opening at a predetermined pressure and/or temperature. Thermostatically operated valves close when the pressure is relieved or the temperature is reduced. Fusible plug valves require replacement of the plug. See also valve, safety relief and valve, regulating. Temperature.

Mechanic Bill explains Relief Valve

Pricing and Availability

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NSN 4820016465998

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
11-878 Actronics Incorporated
60875-002 Ametek Thermal Systems Inc
Stock Check
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